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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
// This program determines which OS that this Valgrind installation
// supports, which depends on what was chosen at configure-time.
//
// We return:
// - 0 if the machine matches the asked-for OS and satisfies a
// version requirement, if any
// - 1 if it doesn't match but does match the name of another OS
// - 2 if it doesn't match the name of any OS
// - 3 if there was a usage error (it also prints an error message)
// Nb: When updating this file for a new OS, add the name to
// 'all_OSes' as well as adding go().
#define False 0
#define True 1
typedef int Bool;
char* all_OSes[] = {
"linux",
"darwin",
NULL
};
#if defined(VGO_linux)
static Bool matches_version(char *min_version)
{
int a1, a2, a3, g1, g2, g3; // 'a' = actual; 'g' = given
if (min_version == NULL) return True; // no version specified
// get actual version number
FILE *fp = fopen("/proc/sys/kernel/osrelease", "r");
if (fp == NULL || fscanf(fp, "%d.%d.%d", &a1, &a2, &a3) != 3) return False;
fclose(fp);
// parse given version number
if (sscanf(min_version, "%d.%d.%d", &g1, &g2, &g3) != 3) return False;
// printf("actual %d %d %d\n", a1, a2,a3);
// printf("given %d %d %d\n", g1, g2,g3);
if (a1 > g1) return True;
if (a1 < g1) return False;
if (a2 > g2) return True;
if (a2 < g2) return False;
if (a3 >= g3) return True;
return False;
}
#endif
static Bool go(char* OS, char *min_version)
{
#if defined(VGO_linux)
if ( 0 == strcmp( OS, "linux" ) && matches_version( min_version )) return True;
#elif defined(VGO_darwin)
if ( 0 == strcmp( OS, "darwin" ) ) return True;
#else
# error Unknown OS
#endif // VGO_*
return False;
}
//---------------------------------------------------------------------------
// main
//---------------------------------------------------------------------------
int main(int argc, char **argv)
{
int i;
if ( argc < 2 ) {
fprintf( stderr, "usage: os_test <OS-type> [<min-version>]\n" );
exit(3); // Usage error.
}
if (go( argv[1], argv[2] )) {
return 0; // Matched.
}
for (i = 0; NULL != all_OSes[i]; i++) {
if ( 0 == strcmp( argv[1], all_OSes[i] ) )
return 1; // Didn't match, but named another OS.
}
return 2; // Didn't match any OSes.
}
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